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Forum: Psychology Statistics

Psychological statistics, quantitative psychology. Statistics in social sciences. Experimental design, data analysis.

  1. Arrow Sticky Thread Sticky: Please Read This Before Posting

    Please provide us with some basic information before we can give useful advice: 1. purpose of the study / research question / hypotheses, if...

    Started by quark‎, 11-10-2005 12:21 AM
    • Replies: 0
    • Views: 21,233
    11-10-2005, 12:21 AM Go to last post
  1. "bias" in chi-square GOF tests?

    Simple question (simple for some people) about the chi-square GOF test: Let's say we do a chi-square GOF test where the the expected values are...

    Started by bruin‎, 12-07-2015 02:14 PM
    • Replies: 1
    • Views: 513
    12-07-2015, 02:40 PM Go to last post
  2. Disagreement with my advisor about Cronbach's alpha for my thesis

    My psychology thesis is for an interdisciplinary degree, so I wasn't able to take any advanced methods before completing the research. I took two...

    Started by adtree74‎, 12-06-2015 03:30 PM
    • Replies: 2
    • Views: 557
    12-06-2015, 05:34 PM Go to last post
  3. What's a good resource to brush up on college level psychology stats?

    I've taken quite a few different courses, but have since forgotten some of the details. I'm interested in the applied aspects of sampling, all sorts...

    Started by etest‎, 12-02-2015 12:28 PM
    • Replies: 1
    • Views: 630
    12-02-2015, 08:24 PM Go to last post
  4. Comparing absolute values of difference scores between two groups

    I have two groups (A and B) that each completed a different version of an experimental measure (measure A and measure B). Both groups also completed...

    Started by ShakeyD‎, 12-01-2015 09:34 PM
    measurement, reliability, variance
    • Replies: 4
    • Views: 716
    12-02-2015, 06:19 PM Go to last post
  5. Dealing with Missing Data...

    So I have ran into an issue with my study. We utilized Qualtrics to design an online survey/study that had subjects complete 10 questionnaires and...

    Started by theemezz0‎, 11-30-2015 12:41 PM
    • Replies: 9
    • Views: 1,027
    12-01-2015, 07:19 PM Go to last post
  6. I failed the 4/5ths Rule. Can I prove it is not significant?

    I am a (hypothetical) employer who used an aptitude test to screen candidates for their trainability before hire. I am being sued for discriminating...

    Started by cellardoor367‎, 12-01-2015 11:10 AM
    eeoc, four fifths rule, t test, uniform guidelines
    • Replies: 1
    • Views: 514
    12-01-2015, 04:47 PM Go to last post
  7. 3 experiments and the same 3 scales as DV - run Factorial Analysis together or sep

    Hi! I realized three experiments (varying only the marketing context) and used as dependent variables the same three scales (attitude, purchase...

    Started by fabiorfborges‎, 11-30-2015 06:40 AM
    experiments, factor analysis
    • Replies: 1
    • Views: 429
    12-01-2015, 08:09 AM Go to last post
  8. Question Repeated measures ANCOVA in SPSS help needed with multiple covariates

    Hello everyone. Hope someone can help. I have a repeated measures (4) ancova I need to run with no between subjects factor. I have 5 covariates....

    Started by ANCOVA'D‎, 11-26-2015 01:15 PM
    ancova, repeated measures
    • Replies: 2
    • Views: 752
    11-27-2015, 06:14 AM Go to last post
  9. Help me in two way anova please

    After using log transformation, my data is homogenous. So i want to use two way anova analysis. In that analysis should i data that has been...

    Started by Sabila‎, 11-25-2015 03:42 PM
    • Replies: 3
    • Views: 588
    11-26-2015, 03:32 AM Go to last post
  10. Is this data normally distributed?

    Got my question answered. Thank you guys

    Started by paperrockbazooka‎, 11-24-2015 08:22 PM
    • Replies: 5
    • Views: 810
    11-26-2015, 02:25 AM Go to last post
  11. Help in Levene's test, Please

    Hi, I did an experiment, studying on the effects of types of sugar and their concentrations on milk spoilage. The sugars I was using are sucrose,...

    Started by bom_bomkung‎, 11-30-2006 09:51 PM
    • Replies: 13
    • Views: 27,979
    11-25-2015, 03:39 PM Go to last post
  12. Incremental validity testing

    Hi everyone, The short story first: I was asked by reviewers to formally test whether a variable V1 is incrementally valid (explains more...

    Started by katsch‎, 11-25-2015 01:00 AM
    • Replies: 0
    • Views: 405
    11-25-2015, 01:00 AM Go to last post
  13. t-test help- what is the IV???

    I did an experiment where I got data on children’s playmate choices (like if they chose to play with boys or girls or both or neither). My...

    Started by heeeeeellllllpppppppppp‎, 11-18-2015 03:05 PM
    proportion test
    • Replies: 8
    • Views: 893
    11-19-2015, 06:07 AM Go to last post
  14. multiple regfression

    Hello forum.I am very new in statistics so pardon me if the questions are too silly:) Within the frameworks of a lab report, i conducted a multiple...

    Started by LEMONIAS‎, 11-14-2015 11:37 PM
    • Replies: 8
    • Views: 869
    11-16-2015, 11:16 PM Go to last post
  15. creating scores based on LCA classification

    With LCA (Mplus) on 11 variables, we grouped 1100 patients into 3 classes. Now, we want to create a score, to classify future patients to one of...

    Started by fengyuwuzu‎, 11-13-2015 10:13 AM
    • Replies: 0
    • Views: 454
    11-13-2015, 10:13 AM Go to last post
  16. How to create norms for a new assessment?

    If a novel assessment is created and tested on hundreds of participants, what is the process of converting raw scores to standard scores with a mean...

    Started by blc‎, 11-12-2015 11:19 AM
    • Replies: 1
    • Views: 585
    11-12-2015, 11:30 AM Go to last post
  17. Bar graph showing difference of means

    Is there a way to create a bar graph, with multiple DVs, showing the difference between the means of the IV? I have two experimental conditions and...

    Started by Tigerlily‎, 11-09-2015 04:10 PM
    bar graph, difference of means, multiple dv's
    • Replies: 8
    • Views: 848
    11-11-2015, 04:57 PM Go to last post
  18. Regression to the mean

    Hello, I have a question concerning regression to the mean. Suppose there is a test X, which is taken by 30 people. Person A has a score of 10...

    Started by Helge‎, 11-06-2015 02:15 PM
    • Replies: 1
    • Views: 533
    11-10-2015, 03:09 AM Go to last post
  19. What statistical test should I use.

    So I am writing a report on whether mean intelligence through an IQ test and mean psychopathy scores (DV) are significant in different types of crime...

    Started by TomXD1‎, 11-04-2015 01:17 PM
    analysis, psychology, test
    • Replies: 0
    • Views: 503
    11-04-2015, 01:17 PM Go to last post
  20. How do you display the correlation significance level (.08**) in AMOS

    Sorry this is a basic question but I can't figure out how to display the significance level asterisks associated with the correlations/covariances on...

    Started by Cardale‎, 11-03-2015 03:23 PM
    • Replies: 0
    • Views: 388
    11-03-2015, 03:23 PM Go to last post
  21. Question (SPSS) Meta-analysis about control variables in psychology research

    Hello everyone, I'm doing a research on the use of control variables in studies about 'the psychological contract'. I'm almost done with my...

    Started by Paolo‎, 11-03-2015 12:58 PM
    coding, control variables, psychological contract, spss
    • Replies: 0
    • Views: 432
    11-03-2015, 12:58 PM Go to last post
  22. Z-Scores: Finding the score which separates the top 40% from the bottom 60%?

    Hi there I am struggling a little with my z-scores. This was one of my questions which I do not understand: For a normal distribution with a mean...

    Started by gpmp1996‎, 11-03-2015 04:36 AM
    z-scores
    • Replies: 1
    • Views: 558
    11-03-2015, 09:56 AM Go to last post
  23. If total variance explained is less than 60%...

    I am conducting an exploratory factor analysis of some data exploring bullying behaviour. In my initial EFA I have found that 11 factors were...

    Started by rubyred89‎, 11-01-2015 04:25 PM
    • Replies: 4
    • Views: 1,168
    11-03-2015, 05:17 AM Go to last post
  24. How to analyze dichotomous DV with between- and within-subjects factors?

    Hello everybody, I am designing a study and need to make sure I'll be able to analyze the data (or else I will modify the design). For the...

    Started by blc‎, 10-28-2015 12:04 AM
    dichotomous dv, logit regression, mixed design, multilevel modeling, within-subject
    • Replies: 2
    • Views: 724
    10-28-2015, 03:55 PM Go to last post
  25. Physiological response to musical stimuli

    I have performed a study whereby I measure participant’s physiological response (HRV which is a continuous variable) to different musical stimuli....

    Started by p_billy_c‎, 10-26-2015 05:10 AM
    • Replies: 4
    • Views: 674
    10-28-2015, 07:59 AM Go to last post
  26. How to analyse data when subjects received both control and experimental condition?

    Dear all, I hope to get some suggestions on how to analyse the data from an experiment I recently ran. My question is whether a new treatment has a...

    Started by Marieke21‎, 10-27-2015 11:09 AM
    control condition, pre-post, repeated measures, treatment
    • Replies: 2
    • Views: 474
    10-27-2015, 11:37 AM Go to last post
  27. Checking homogeneity of regression with multiple covariates

    Hi, I am running an ANCOVA with 2 fixed factors, while controlling for 3 covariates, and I would like to test the assumption of homogeneity of...

    Started by nielsl‎, 10-27-2015 09:56 AM
    • Replies: 0
    • Views: 332
    10-27-2015, 09:56 AM Go to last post
  28. Help please with bootstrapping HMR SPSS output interpretation and reporting

    Hi I am in the middle of writing up a lab that is due in 12 hours (eeekkkk!!) and I am having issues interpreting the SPSS output on a bootstrapped...

    Started by Becdev‎, 10-25-2015 06:01 AM
    • Replies: 0
    • Views: 467
    10-25-2015, 06:01 AM Go to last post
  29. Non-parametric and parametric tests combined ??

    Hi everyone, I'm achieving a postdoc study in Psychology (75 participants) in Belgium and I need your help... The aim of the study is to look at...

    Started by shaxhe‎, 10-19-2015 09:21 AM
    • Replies: 6
    • Views: 733
    10-20-2015, 02:37 PM Go to last post
  30. Post I would really appreciate your Help very important to me

    I have an exam next week and I got sample questions that look like these two below: It would really help if someone would explain me just a...

    Started by Henrico‎, 10-20-2015 02:09 PM
    • Replies: 0
    • Views: 480
    10-20-2015, 02:09 PM Go to last post
  31. presenting the results of logistic regression with dichotomous IVs

    I have a question about how to present the results of a series of 6 logistic regressions in which I have the same 2 dichotomous/binary IVs. The...

    Started by charles matthew‎, 10-18-2015 09:38 PM
    binary outcome, dichotomous iv, logistic regression, presentation
    • Replies: 1
    • Views: 522
    10-19-2015, 09:13 AM Go to last post
  32. w-score vs. z-score with age/sex covariate

    Hi everyone, I want to predict gray matter (GM) volume in a group of patients based on their degree of cognitive impairment, corrected for age and...

    Started by AnLo‎, 10-15-2015 11:14 AM
    z-score
    • Replies: 0
    • Views: 634
    10-15-2015, 11:14 AM Go to last post
  33. Research statistics conundrum!

    Hello, I'm completing my proposal for my dissertation and I've gotten to the statistical analysis and having a bit of a me***own, hoping to get some...

    Started by getlonelyy‎, 10-15-2015 05:16 AM
    • Replies: 0
    • Views: 431
    10-15-2015, 05:16 AM Go to last post
  34. MANOVA vs Chi Square (and continuous variables?)

    **edited to add: Hmmm, maybe I should have named the thread MANOVA vs. Chi Square vs. two regression analyses?** Hi all, I'm in the final stages...

    Started by jessireebob‎, 10-11-2015 10:22 AM
    • Replies: 0
    • Views: 490
    10-11-2015, 10:22 AM Go to last post
  35. BEST STATISTIC TO USE for TWO STATIC GROUPS?

    I am formulating a study which involves first separating participants into two groups for a specific sleep disorder experienced either no/low fear ...

    Started by yudkush‎, 10-05-2015 09:14 PM
    • Replies: 0
    • Views: 592
    10-05-2015, 09:14 PM Go to last post
  36. psych stats

    vampires in rumanian are 315 years old, on average, with a standard deviation of 5, and the distribution of their ages is mound-shaped and...

    Started by dorion83‎, 10-02-2015 06:59 PM
    • Replies: 3
    • Views: 668
    10-02-2015, 08:10 PM Go to last post
  37. Thumbs up value for the balance of 2 categories (while controlling for absolute number)

    Hi! Thank you so much for any help! Situation: I have different ascriptions per subject which are categorized in female (f), male (m) and...

    Started by Nelly2‎, 10-02-2015 10:07 AM
    • Replies: 0
    • Views: 350
    10-02-2015, 10:07 AM Go to last post
  38. Subscale CFA

    Hi, An existing questionnaire I am using (23 items, supposedly 2 subscales, N = 700) has shown poor fit to the 2-factor model as specified by its...

    Started by nielsl‎, 10-01-2015 09:35 AM
    cfa
    • Replies: 2
    • Views: 680
    10-02-2015, 05:34 AM Go to last post
  39. four way anova

    Hi, I conduct a research with 4 between-subjects independent variables (2 levels each) and 1 dependant variable. I intrested to find out if there...

    Started by natan1‎, 09-30-2015 10:20 AM
    • Replies: 1
    • Views: 554
    09-30-2015, 12:38 PM Go to last post
  40. Question Implications for analysis of survey data when recall time frames differ bt questions

    Hi, I am advising some folks on setting up a brief survey containing questions that measure some well-known health indicators. My curiosity was...

    Started by SabbyATL‎, 09-25-2015 12:48 PM
    recall, survey, time frames
    • Replies: 6
    • Views: 880
    09-30-2015, 11:05 AM Go to last post
  41. Logistic Regression Question

    I have a continuous predictor variable (a score in a class) from 0 to 100 and a binary outcome variable for the passing of a different class...

    Started by Psych_Lab_Rat‎, 09-28-2015 12:55 PM
    • Replies: 1
    • Views: 583
    09-28-2015, 01:54 PM Go to last post
  42. Inter-rater reliability for multiple choice questions, 5 raters per question

    Hi, I'm interested in how people describe messages posted online, so I'm asking people to read messages and choose their topics. My goal is then...

    Started by replica‎, 09-27-2015 09:28 AM
    • Replies: 0
    • Views: 233
    09-27-2015, 09:28 AM Go to last post
  43. Check if Groups differ from Expectation Value

    Hi! I have data from RCT with one treatment group and one control group. Each participant filled out a questionnaire once a weak (stanine scores),...

    Started by LeslieL‎, 09-26-2015 03:16 PM
    • Replies: 0
    • Views: 463
    09-26-2015, 03:16 PM Go to last post
  44. R squared in structural equation modeling

    Hello I recently started working with structural equation modeling. I am doing a study for which I tested a model like this: Var1 --> var2-->...

    Started by Stef Van Puyenbroeck‎, 08-05-2015 07:24 AM
    r squared, sem, structural equation model
    • Replies: 8
    • Views: 1,394
    09-23-2015, 08:49 AM Go to last post
  45. Growth Modeling of Longitudinal Data: Growth factors as predictors in Regression

    Hey! i have this following situation. I have a dataset of four measurement occasions. In the first three occasions the same test was introduced....

    Started by schadeati‎, 09-22-2015 05:52 AM
    • Replies: 0
    • Views: 438
    09-22-2015, 05:52 AM Go to last post
  46. difference between mailed cohorts and control cohorts

    what is the difference between mailed cohorts and control cohorts Ive been given this data to analyse but I'm not sure on what cols2 and 3 refer...

    Started by dispersion‎, 09-21-2015 03:04 PM
    • Replies: 1
    • Views: 548
    09-21-2015, 03:24 PM Go to last post
  47. experiemental items in factor analysis

    Good morning, everyone. We are analyzing a questionnaire data set, which has some core items and some experimental items. The core items are those...

    Started by fengyuwuzu‎, 09-21-2015 10:32 AM
    • Replies: 0
    • Views: 393
    09-21-2015, 10:32 AM Go to last post
  48. Calculating Partial Correlation from Published Work

    I am working on a meta-analysis, and I read in a published meta-analysis that the researchers calculated partial correlations controlling for two...

    Started by vltompkins‎, 09-20-2015 09:54 PM
    calculating correlation, partial correlation
    • Replies: 1
    • Views: 546
    09-21-2015, 03:40 AM Go to last post
  49. Calculating effect size at T2 while controling for baseline differences.

    Hi Everyone, I would really appreciate some pointers how I might calculate a treatment V control effect size at T2 (using means, SD's, and sample...

    Started by PavolovsDog‎, 09-20-2015 11:56 AM
    • Replies: 0
    • Views: 411
    09-20-2015, 11:56 AM Go to last post
  50. Transforming a negatively skewed ikert scale dependent variable for ANOVA and M.Reg

    Hello, I have a negatively skewed Likert scale as my dependent variable and would like to use parametric testing (multiple regression and ANOVA)....

    Started by Muppet‎, 09-19-2015 05:08 AM
    likert, negative skew, transformation
    • Replies: 4
    • Views: 561
    09-19-2015, 06:01 PM Go to last post
  51. Mixed method ANOVA post hoc confusion?

    My experiment had a between-subjects variable of condition (experimental and control) and a within-subjects variable of time (baseline and follow-up...

    Started by fellis‎, 09-19-2015 01:18 PM
    • Replies: 1
    • Views: 558
    09-19-2015, 02:25 PM Go to last post
  52. How to measure- effect of additional categorical DV on repeated m. ANOVA?

    Hello, I am helping a colleague analyze data from a user study. I am a little unclear how to deal with one of her measures. I would greatly...

    Started by ecramer‎, 09-18-2015 10:07 PM
    anova, categorical covariate, data analysis, repeated measures
    • Replies: 4
    • Views: 521
    09-19-2015, 02:03 PM Go to last post
  53. Unhappy HELP PLEASE :) ANOVAs repeated measures

    More I read more I get confused, so please help me ! 1. In 2 (2 conditions)x2 (2 time intervals) within subjects Anova if normality assumption is...

    Started by Kinga‎, 09-18-2015 04:47 PM
    anova, one-way anova, repeated measures, within-subjects
    • Replies: 0
    • Views: 438
    09-18-2015, 04:47 PM Go to last post
  54. Query on item response theory. Pls help

    When an examination involving 250 multiple choice questions is being evaluated by item response theory , and the candidates ability score is being...

    Started by Pseudomonas‎, 09-13-2015 08:10 AM
    • Replies: 0
    • Views: 507
    09-13-2015, 08:10 AM Go to last post
  55. Detect possible subgroups in sample

    Hi, My data consist of the total scores from a questionnaire (N=700). The distribution is somewhat negatively skewed, however there appears to be...

    Started by nielsl‎, 09-08-2015 03:19 PM
    • Replies: 2
    • Views: 655
    09-10-2015, 06:09 AM Go to last post
  56. Psychology textbook error regarding stats?

    Hi all, I'm teaching a community college psychology class this semester out of a new textbook, and the book contains this claim: My first...

    Started by bruin‎, 09-09-2015 04:39 PM
    • Replies: 6
    • Views: 837
    09-10-2015, 01:27 AM Go to last post
  57. Sum of Squares

    My homework problem says: For the following summary statistics, find ∑X and SS (sum of squares) a. XBar = 25, s = 10, n = 11 So,I have that...

    Started by JWade‎, 09-07-2015 01:52 PM
    sum of squares
    • Replies: 1
    • Views: 571
    09-07-2015, 02:53 PM Go to last post
  58. SEM with categorical variable/parceling/how to enter in AMOS?

    I need to do an SEM and I'm stumped about what to do with one of my variables, which is a nominal categorical variable (previous experience in x vs....

    Started by buntington‎, 04-14-2014 03:56 PM
    3 Pages
    1 2 3
    sem
    • Replies: 32
    • Views: 8,873
    09-07-2015, 07:00 AM Go to last post
  59. Help with the level of measurement for correct/incorrect answers

    Please, help bring in some lucidity and fill in any possible gaps in my reasoning. The research assessed the participants' recall of a narrative...

    Started by Billy the Poet‎, 09-01-2015 07:04 PM
    2 Pages
    1 2
    categorical, dichotomous, level of measurement, logit
    • Replies: 17
    • Views: 2,248
    09-04-2015, 04:27 PM Go to last post
  60. What statistical analysis to use?

    HI, Each of the participants completed 7 tasks. I collected several measures in each task (like answer correctness, perception of difficulty, time...

    Started by Sam31‎, 08-31-2015 12:11 PM
    • Replies: 2
    • Views: 707
    09-04-2015, 05:01 AM Go to last post

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